warning: denote infinite loops with `loop { ... }`
  --> $DIR/block-must-not-have-result-while.rs:2:5
   |
LL |     while true {
   |     ^^^^^^^^^^ help: use `loop`
   |
   = note: `#[warn(while_true)]` on by default

error[E0308]: mismatched types
  --> $DIR/block-must-not-have-result-while.rs:3:9
   |
LL |         true
   |         ^^^^ expected (), found bool
   |
   = note: expected unit type `()`
                   found type `bool`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.